Very tricky questions. ‘Gran’ always sound to me like someone in their sixties, but there are more and more grandmothers in their thirties and forties. Is it right to preclude someone because they have no grandchildren. Definitely not, there are many reasons that people do not have grandchildren, some as the result of decisions made by their children. Many older women have young relatives, and their experiences with them often provide a more balanced view, but behaviour etc.
There are many more things. Could add much more but I want to conclude by saying that I am very much against, as a mother and grandmother, in precluding anyone from the forum unless they have joined to mock or make mischief. Live and let live, I say, and dividing women into groups is very very wrong.